Research plan for the Spanish exploratory longline fishery for Dissostichus spp. in Divisions 58.4.1 and 58.4.2: Update of stage 2 (2013/14 season) and preliminary results of stage 1 (2012/13 season) according to WG-SAM advice

A revision of the research plan and preliminary results of the Spanish exploratory longline fishery for Dissostichus spp in Divisions 58.4.1 and 58.4.2, submitted to the XXXII-WG-SAM, taking into account the advice made by the Working Group, is presented.



The Spanish vessel Tronio started the research plan in the 2012/13 season using the Spanish bottom longline system. One depletion experiments was completed in each of the SSRU surveyed (58.4.1H and 58.4.1G). Three prospecting-phase clusters of sets did not reach the threshold to start the depletion.



A new prospective estimation of the local biomass (B_LOC) of the two localized areas where the depletion experiments were performed is done as well as an estimation of the biomass of the SSRUs (B_SSRU), maximal and minimal, considering areas with high and low densities, with a better fit of the regression and lower residuals than the previous analysis.   

 

An analysis of relevant sea-ice conditions in the last 11 seasons in these areas along with a summary of the activities and results from the survey is also presented related to the sampling scheme, collected samples and species involved.